A small bowing squall line moved from northern Iowa across southern Wisconsin during the evening hours on June 29th into the early morning hours of June 30th.  Large trees were knocked down with this bow echo across northern Iowa, Sauk, and Columbia counties before it weakened around 0000CST on the 30th.  Spotter noted that the the gust front raced ahead of the storms, cutting off the inflow.  Another line of storms developed behind the initial bow between 0100CST and 0200CST, and pushed across areas mainly north of Interstate 94.  More large trees were toppled in Marquette, Columbia, Dane, Dodge, Jefferson, and Waukesha counties.  As the second bow pushed east, it weakened, but still produced penny sized hail in Port Washington.  Shortly after 0200CST, clusters of thunderstorms developed across Walworth and Rock counties and pushed into Waukesha, Milwaukee, Racine, and Kenosha counties between 0300CST and 0400CST.  Scattered reports of toppled large trees were noted with this activity.  Synoptically, a low pressure system tracked into northern Minnesota, dragging a cold front into southern Wisconsin.  Warm, humid, and unstable conditions ahead of the system helped to produce severe thunderstorms despite the unfavorable time of day.

Thunderstorm Wind in WAUKESHA, WISCONSIN
From 30-JUN-05 02:50:00 to 30-JUN-05 02:50:00 (CST)
Location: EAGLE
Magnitude: 56 EG
Reported by: LAW ENFORCEMENT

Thunderstorm Wind in ROCK, WISCONSIN
From 30-JUN-05 02:52:00 to 30-JUN-05 02:52:00 (CST)
Location: JANESVILLE
Magnitude: 52 EG
Reported by: LAW ENFORCEMENT

Thunderstorm Wind in ROCK, WISCONSIN
From 30-JUN-05 02:55:00 to 30-JUN-05 02:55:00 (CST)
Location: JANESVILLE
Magnitude: 52 EG
Reported by: LAW ENFORCEMENT

Thunderstorm Wind in WAUKESHA, WISCONSIN
From 30-JUN-05 02:00:00 to 30-JUN-05 02:00:00 (CST)
Location: MERTON
Magnitude: 56 EG
Reported by: LAW ENFORCEMENT

Thunderstorm Wind in SAUK, WISCONSIN
From 30-JUN-05 00:05:00 to 30-JUN-05 00:05:00 (CST)
Location: LAKE DELTON
Magnitude: 52 EG
Reported by: LAW ENFORCEMENT

Thunderstorm Wind in WAUKESHA, WISCONSIN
From 30-JUN-05 03:45:00 to 30-JUN-05 03:45:00 (CST)
Location: BROOKFIELD
Magnitude: 52 EG
Reported by: TRAINED SPOTTER

Thunderstorm Wind in MILWAUKEE, WISCONSIN
From 30-JUN-05 03:55:00 to 30-JUN-05 03:55:00 (CST)
Location: MILWAUKEE
Magnitude: 56 EG
Reported by: LAW ENFORCEMENT

Thunderstorm Wind in COLUMBIA, WISCONSIN
From 30-JUN-05 00:27:00 to 30-JUN-05 00:27:00 (CST)
Location: POYNETTE
Magnitude: 52 EG
Reported by: LAW ENFORCEMENT

Lightning in LAFAYETTE, WISCONSIN
From 30-JUN-05 00:12:00 to 30-JUN-05 00:12:00 (CST)
Location: ARGYLE
Property damage: .2K
Reported by: LAW ENFORCEMENT

Lightning struck a child's playhouse, setting it on fire.

Thunderstorm Wind in WALWORTH, WISCONSIN
From 30-JUN-05 02:30:00 to 30-JUN-05 02:30:00 (CST)
Location: DELAVAN
Magnitude: 52 EG
Reported by: LAW ENFORCEMENT

Thunderstorm Wind in ROCK, WISCONSIN
From 30-JUN-05 02:50:00 to 30-JUN-05 02:50:00 (CST)
Location: JANESVILLE
Magnitude: 52 EG
Reported by: LAW ENFORCEMENT

Thunderstorm Wind in MARQUETTE, WISCONSIN
From 30-JUN-05 01:20:00 to 30-JUN-05 01:20:00 (CST)
Location: HARRISVILLE
Magnitude: 56 EG
Reported by: LAW ENFORCEMENT

Hail in OZAUKEE, WISCONSIN
From 30-JUN-05 02:30:00 to 30-JUN-05 02:30:00 (CST)
Location: PORT WASHINGTON
Magnitude: 0.75 
Reported by: GENERAL PUBLIC

Thunderstorm Wind in COLUMBIA, WISCONSIN
From 30-JUN-05 01:36:00 to 30-JUN-05 01:36:00 (CST)
Location: RIO
Magnitude: 52 EG
Reported by: LAW ENFORCEMENT

Thunderstorm Wind in DODGE, WISCONSIN
From 30-JUN-05 01:18:00 to 30-JUN-05 01:18:00 (CST)
Location: RANDOLPH
Magnitude: 56 EG
Reported by: LAW ENFORCEMENT

Thunderstorm Wind in ROCK, WISCONSIN
From 30-JUN-05 03:05:00 to 30-JUN-05 03:05:00 (CST)
Location: MILTON
Magnitude: 56 EG
Reported by: LAW ENFORCEMENT

Thunderstorm Wind in WAUKESHA, WISCONSIN
From 30-JUN-05 03:00:00 to 30-JUN-05 03:00:00 (CST)
Location: GENESEE
Magnitude: 52 EG
Reported by: LAW ENFORCEMENT

Thunderstorm Wind in MILWAUKEE, WISCONSIN
From 30-JUN-05 04:00:00 to 30-JUN-05 04:00:00 (CST)
Location: GREENFIELD
Magnitude: 56 EG
Reported by: GENERAL PUBLIC

Thunderstorm Wind in MILWAUKEE, WISCONSIN
From 30-JUN-05 04:05:00 to 30-JUN-05 04:05:00 (CST)
Location: MILWAUKEE
Magnitude: 56 EG
Reported by: TRAINED SPOTTER

Thunderstorm Wind in IOWA, WISCONSIN
From 29-JUN-05 23:39:00 to 30-JUN-05 00:39:00 (CST)
Location: DODGEVILLE
Magnitude: 56 EG
Reported by: LAW ENFORCEMENT

Thunderstorm Wind in ROCK, WISCONSIN
From 30-JUN-05 02:20:00 to 30-JUN-05 02:20:00 (CST)
Location: NEWARK
Magnitude: 65 EG
Reported by: LAW ENFORCEMENT

Thunderstorm Wind in WALWORTH, WISCONSIN
From 30-JUN-05 02:20:00 to 30-JUN-05 02:20:00 (CST)
Location: SHARON
Magnitude: 56 EG
Reported by: LAW ENFORCEMENT